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US4600604A
Expired / Lapsed
US
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Metal oxide-coated copper powder
Assignee: EIDP Inc
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Filing: 1985-09-30
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Granted: 1986-07-15
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Expires: 2005-09-30
Abstract
Abstract Particles of Cu-containing metal having a particle size of 0.5-20 mu m in largest dimension bearing a thin, substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and method of making them. The metal oxide-coated particles have improved sintering and shrinking properties which closely match those of green ceramic tape.
Inventors
- 👤 Vincent P. Siuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; B; B22; B22F; B22F1/00; B22F1/16; C; C09; C09D; C09D5/00; C09D5/24; H01; H01B; H01B1/00; H01B1/02; H01B1/026; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
Particles of Cu-containing metal having sintering and shrinkage characteristics which more closely match those of green ceramic tape, bearing a substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and having a particle size of 0.5-20 μm in largest dimension and a surface area less than 1.0 m 2 /g.
Claim 2
Dependent Claim
61 words
Particles of Cu-containing metal having sintering and shrinkage characteristics which more closely match those of green ceramic tape, bearing a substantially continuous coating of at least one metal oxide having a free energy of formation more negative than -98 kcal/mole and having a particle size of 0.5-20 μm in largest dimension and a surface area less than 1.0 m 2 /g.
Claim 3
Dependent Claim
37 words
The coated particles of claim 1 on which the coating is an oxide of a metal selected from the group consisting of Si, Ti, Ce, Zr, Al, Ba, Sr, La, Mg, Ca, V, Ta and mixtures thereof.
Claim 4
Dependent Claim
26 words
The coating particles of claim 1 in which the Cu-containing metal is selected from the group consisting of Cu, Cu/Cd, Cu/Zr, Cu/Ti, Cu/Cr and mixtures thereof.
Claim 5
Dependent Claim
13 words
The coated particles of claim 1 in which the Cu-containing metal is Cu.
Claim 6
Independent Claim
137 words
A method for more closely matching the shrinkage of green ceramic tape and raising and sintering temperature of finely divided Cu-containing metal particles comprising the sequential steps of: (a) dispersing the Cu metal particles in a solution comprising (1) an organometallic compound of a metal, the oxide of which has a free energy of formation more negative than -98 kcal/mole dissolved in (2) a volatile organic solvent, (b) while maintaining the dispersion by agitation, removing the solvent by evaporation, thus forming a coating of the organometallic compound on the Cu-containing metal particles, and (c) treating the organometallic compound-coating Cu metal particles in a reducing atmosphere at an elevated temperature and for a time sufficient to effect reduction of any copper oxide on the copper metal particles and decomposition of the organometallic compound to the corresponding metal oxide.
Claim 7
Independent Claim
137 words
A method for more closely matching the shrinkage of green ceramic tape and raising and sintering temperature of finely divided Cu-containing metal particles comprising the sequential steps of: (a) dispersing the Cu metal particles in a solution comprising (1) an organometallic compound of a metal, the oxide of which has a free energy of formation more negative than -98 kcal/mole dissolved in (2) a volatile organic solvent, (b) while maintaining the dispersion by agitation, removing the solvent by evaporation, thus forming a coating of the organometallic compound on the Cu-containing metal particles, and (c) treating the organometallic compound-coating Cu metal particles in a reducing atmosphere at an elevated temperature and for a time sufficient to effect reduction of any copper oxide on the copper metal particles and decomposition of the organometallic compound to the corresponding metal oxide.
Claim 8
Dependent Claim
41 words
A method for increasing the shrinkage of copper powders comprising the method of claim 5 in which the oxide-coated Cu-containing metal particles are mildly milled to effect flattening of the particles without substantially changing the surface area-to-weight ratio of the particles.
Claim 9
Dependent Claim
19 words
The method of claim 6 in which milling of the particles is carried out during steps (a) and (b).
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |